AITA for refusing to return my nieces wedding dress that I paid for and she decided she doesn’t like?

I (f26) paid for my sister (f33)’s stepdaughter’s (f24) wedding dress. My sister married her mother when the girl was already an adult. I paid for her dress because she loved it (it was a custom Pnina Tornai) and my sister couldn’t afford it. <br><br>It was made with custom measurements and was stunning. The girl looked lovely and the wedding was very nice. <br><br>Recently, my sister told me my niece is blaming her (and me) for the dress being ugly. She said she hates it now and that we made her wear it. My niece is very spoiled and has always gotten her way but I’m not paying for a new dress and my sister can’t afford one either. She’s being stupid lmao<br><br>Edit: I didn’t buy a dress from a store! I paid for a custom dress and my niece has worn it already. I don’t know if I’ll ever get married and even if I do, I don’t like the style of this dress. <br><br>Edit 2: Yes! I’m petty enough to keep the dress just to spite my niece to be honest LOL.